Former Owner
- Mark Lansburgh1
- Markus Fugger1
- Mary Augusta Strachey1
- Mary Schell Collins1
- Matthias Corvinus1
- Maximilian Henry of Bavaria1
- Mayer Sulzberger1
- Mazliah Finzi1
- Melk Abbey1
- Merlemont family1
- Michael Wodhull1
- Michel Chasles1
- Michel de Léon1
- Michele Amari1
- Michiel family1
- Monastero di Santo Spirito in Verona1
- Moritz Dessauer1
- Moritz Joseph Johann von Dietrichstein1
- Morris Jastrow, Jr.1
- Murray Anthony Potter1